Search results for "Rift"

Prototype-based learning on concept-drifting data streams

2014

Data stream mining has gained growing attentions due to its wide emerging applications such as target marketing, email filtering and network intrusion detection. In this paper, we propose a prototype-based classification model for evolving data streams, called SyncStream, which dynamically models time-changing concepts and makes predictions in a local fashion. Instead of learning a single model on a sliding window or ensemble learning, SyncStream captures evolving concepts by dynamically maintaining a set of prototypes in a new data structure called the P-tree. The prototypes are obtained by error-driven representativeness learning and synchronization-inspired constrained clustering. To ide…

Short communication: Driftwood provides reliable chronological markers in Arctic coastal deposits

2021

Originating from the boreal forest and often transported over large distances, driftwood characterizes many Arctic coastlines. Here we present a combined assessment of radiocarbon (14C) and dendrochronological (ring width) age estimates of driftwood samples to constrain the progradation of two Holocene beach-ridge systems near the Lena Delta in the Siberian Arctic (Laptev Sea). Our data show that the 14C ages obtained on syndepositional driftwood from beach deposits yield surprisingly coherent chronologies for the coastal evolution of the field sites. The dendrochronological analysis of wood from modern drift lines revealed the origin and recent delivery of the wood from the Lena River catc…

Volfgangs Goethe: dzīve un darbi [Volfgangs Gēte]

1925

Saturs: Ievadam 5 Goethes bērnība un agrā jaunība 13 Studenta gadi 26 Herders 36 Vētras un trauksmes laikmets 41 Egmonts un uzvara par jaunības titānismu 58 Pirmie gadi Veimārā 67 Itālijā 82 Atkal Veimārā 94 Ifigenija un Tasso 99 Šillers 113 Goethes audzināšanas romāns — Vilhelms Meisters 118 Goethes paša sevis audzināšana 146 Goethe un politika 154 Hermans un Doroteja 168 Pēc Šillera nāves 172 Pirmradniecība 185 Goethes Pandora un viņa atmiņu grāmata 192 Goethes lirikas posmi 206 Goethe kā domātājs 233 Goethes dzīves gudrība 260 Fausts 289 Goethes rakstu izdevumi 334 Literatūra par Goethi 334

Stochastic dynamics of nonlinear systems with a fractional power-law nonlinear term: The fractional calculus approach

2011

Fractional power-law nonlinear drift arises in many applications of engineering interest, as in structures with nonlinear fluid viscous–elastic dampers. The probabilistic characterization of such structures under external Gaussian white noise excitation is still an open problem. This paper addresses the solution of such a nonlinear system providing the equation governing the evolution of the characteristic function, which involves the Riesz fractional operator. An efficient numerical procedure to handle the problem is also proposed.

Monogràfic en homenatge a Rafael l. Ninyoles: Introducció

2020

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Quantifying the thermo-mechanical impact of plume arrival on continental break-up

2013

Abstract The arrival of a plume head at Earth's continental lithosphere is often considered to be an important factor for continental break-up. However, the impact of plume impingement on strength and duration of a rift remains unclear. In this study, we quantify the mechanical and thermal influence of a plume (i.e. lithosphere erosion) on continental break-up. To do that we apply the three-dimensional numerical code SLIM3D that features realistic elasto-visco-plastic rheology. We model the thermo-mechanical response of a segment of Earth's lithosphere that is affected both by extension as well as plume-related lithosphere erosion in order to evaluate the influence on the overall force budg…

Geochemical investigations applied to active fault detection in a volcanic area: the North-East Rift on Mt. Etna (Sicily, Italy)

1999

Geochemical investigations were performed on the Northeast Rift of Mt. Etna, a prominent volcanic structure of this volcano. Low-temperature fumaroles were found on the upper part of this area and the isotopic compositions of C(CO2) and He suggest a likely magmatic origin of the emitted gases. On the contrary, very low degassing was found in the lower part of the NE-Rift, with CO2 concentrations generally very close to those in air. This pattern is probably due to sealing of the eruptive fissures by the repeated injections of magma solidified into dikes and by consequent shallow hydrothermal alteration of the fissured rocks due to residual magma degassing. High soil CO2 concentrations were …

Cartulaire-rouleau de l'abbaye du Cateau, relatif au bois de Fontaine-au-Bois

2023

Influenza control in the 21st century: Optimizing protection of older adults

2009

Older adults (> or =65 years of age) are particularly vulnerable to influenza illness. This is due to a waning immune system that reduces their ability to respond to infection, which leads to more severe cases of disease. The majority ( approximately 90%) of influenza-related deaths occur in older adults and, in addition, catastrophic disability resulting from influenza-related hospitalization represents a significant burden in this vulnerable population. Current influenza vaccines provide benefits for older adults against influenza; however, vaccine effectiveness is lower than in younger adults. In addition, antigenic drift is also a concern, as it can impact on vaccine effectiveness due t…

Las doleritas toleiticas triasicas del sector SE de la Cordillera Ibérica : Petrología y Geoquímica

1999

Las doleritas toleíticas aflorantes en diapiros triásicos del SE de la Cordillera Ibérica (Alfarp, Quesa y Lugar Nuevo de Fenollet, SE de Valencia) representan líquidos diferenciados (valores bajos en Ni, Cr y mg*) emplazados como sills, de escaso espesor, por debajo de sedimentos (arcillas, margas y yesos), poco consolidados, del límite Triásico superior-Hettangiense. Su composición mineral y geoquímica, con afinidad toleítica continental y similitud a MORB, evidencia el carácter menos diferenciado de las doleritas de Alfarp, respecto a las de Quesa, siendo las doleritas aflorantes en Fenollet las que presentan una composición más evolucionada. Estas doleritas son la expresión de un magmat…